Lawrence Berkeley National Laboratory
Metal-insulator transition in quasi-one-dimensional HfTe3 in the few-chain limit
- Author(s): Meyer, S
- Pham, T
- Oh, S
- Ercius, P
- Kisielowski, C
- Cohen, ML
- Zettl, A
- et al.
Published Web Locationhttps://doi.org/10.1103/PhysRevB.100.041403
© 2019 American Physical Society. The quasi-one-dimensional linear chain compound HfTe3 is experimentally and theoretically explored in the few- to single-chain limit. Confining the material within the hollow core of carbon nanotubes allows isolation of the chains and prevents the rapid oxidation which plagues even bulk HfTe3. High-resolution transmission electron microscopy combined with density functional theory calculations reveals that, once the triple-chain limit is reached, the normally parallel chains spiral about each other, and simultaneously a short-wavelength trigonal antiprismatic rocking distortion occurs that opens a significant energy gap. This results in a size-driven metal-insulator transition.